Earlier quoted context omitted.
People like tailwind because it feels like the correct abstraction. It helps you colocate layout and styling, thereby reducing cognitive load. With CSS you have to add meaningless class names to your html (+remember them), learn complicated (+fragile) selectors, and memorise low level CSS styles. With tailwind you just specify the styling you want. And if using React, the “cascading” piece is already taken care of.
Those are the same selling points as CSS-in-JSS libs like Styled Components. Or CSS Components. Except your last point about "low-level CSS styles" which I'd argue is a weak point. You really should learn the underlying CSS to gain mastery of it. Not arguing for one thing over another, just saying Tailwind really never had anything to offer me personally, but maybe if I wasn't already proficient in CSS and the other…
Sure, when debugging a complex issue, it’s worth knowing the low-level, but CSS is not a great abstraction for day-to-day work.